RAN'COR, noun [Latin from ranceo, to be rank.] 1. The deepest malignity or spite; deep seated and implacable malice; inveterate enmity. [This is the strongest term for enmity which the English language supplies.] It issues from the rancor of a villain. 2. Virulence; corruption.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI